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290 lines
8.9 KiB
C
290 lines
8.9 KiB
C
/* nes_ntsc 0.2.2. http://www.slack.net/~ant/ */
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#include "nes_ntsc.h"
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/* Copyright (C) 2006-2007 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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nes_ntsc_setup_t const nes_ntsc_monochrome = { 0,-1, 0, 0,.2, 0,.2,-.2,-.2,-1, 1, 0, 0, 0, 0 };
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nes_ntsc_setup_t const nes_ntsc_composite = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 };
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nes_ntsc_setup_t const nes_ntsc_svideo = { 0, 0, 0, 0,.2, 0,.2, -1, -1, 0, 1, 0, 0, 0, 0 };
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nes_ntsc_setup_t const nes_ntsc_rgb = { 0, 0, 0, 0,.2, 0,.7, -1, -1,-1, 1, 0, 0, 0, 0 };
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#define alignment_count 3
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#define burst_count 3
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#define rescale_in 8
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#define rescale_out 7
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#define artifacts_mid 1.0f
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#define fringing_mid 1.0f
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#define std_decoder_hue -15
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#define STD_HUE_CONDITION( setup ) !(setup->base_palette || setup->palette)
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#include "nes_ntsc_impl.h"
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/* 3 input pixels -> 8 composite samples */
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pixel_info_t const nes_ntsc_pixels [alignment_count] = {
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{ PIXEL_OFFSET( -4, -9 ), { 1, 1, .6667f, 0 } },
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{ PIXEL_OFFSET( -2, -7 ), { .3333f, 1, 1, .3333f } },
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{ PIXEL_OFFSET( 0, -5 ), { 0, .6667f, 1, 1 } },
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};
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static void merge_kernel_fields( nes_ntsc_rgb_t* io )
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{
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int n;
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for ( n = burst_size; n; --n )
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{
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nes_ntsc_rgb_t p0 = io [burst_size * 0] + rgb_bias;
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nes_ntsc_rgb_t p1 = io [burst_size * 1] + rgb_bias;
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nes_ntsc_rgb_t p2 = io [burst_size * 2] + rgb_bias;
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/* merge colors without losing precision */
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io [burst_size * 0] =
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((p0 + p1 - ((p0 ^ p1) & nes_ntsc_rgb_builder)) >> 1) - rgb_bias;
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io [burst_size * 1] =
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((p1 + p2 - ((p1 ^ p2) & nes_ntsc_rgb_builder)) >> 1) - rgb_bias;
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io [burst_size * 2] =
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((p2 + p0 - ((p2 ^ p0) & nes_ntsc_rgb_builder)) >> 1) - rgb_bias;
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++io;
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}
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}
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static void correct_errors( nes_ntsc_rgb_t color, nes_ntsc_rgb_t* out )
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{
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int n;
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for ( n = burst_count; n; --n )
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{
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unsigned i;
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for ( i = 0; i < rgb_kernel_size / 2; i++ )
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{
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nes_ntsc_rgb_t error = color -
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out [i ] - out [(i+12)%14+14] - out [(i+10)%14+28] -
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out [i + 7] - out [i + 5 +14] - out [i + 3 +28];
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DISTRIBUTE_ERROR( i+3+28, i+5+14, i+7 );
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}
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out += alignment_count * rgb_kernel_size;
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}
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}
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void nes_ntsc_init( nes_ntsc_t* ntsc, nes_ntsc_setup_t const* setup )
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{
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int merge_fields;
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int entry;
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init_t impl;
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float gamma_factor;
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if ( !setup )
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setup = &nes_ntsc_composite;
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init( &impl, setup );
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/* setup fast gamma */
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{
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float gamma = (float) setup->gamma * -0.5f;
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if ( STD_HUE_CONDITION( setup ) )
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gamma += 0.1333f;
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gamma_factor = (float) pow( (float) fabs( gamma ), 0.73f );
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if ( gamma < 0 )
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gamma_factor = -gamma_factor;
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}
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merge_fields = setup->merge_fields;
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if ( setup->artifacts <= -1 && setup->fringing <= -1 )
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merge_fields = 1;
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for ( entry = 0; entry < nes_ntsc_palette_size; entry++ )
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{
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/* Base 64-color generation */
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static float const lo_levels [4] = { -0.12f, 0.00f, 0.31f, 0.72f };
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static float const hi_levels [4] = { 0.40f, 0.68f, 1.00f, 1.00f };
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int level = entry >> 4 & 0x03;
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float lo = lo_levels [level];
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float hi = hi_levels [level];
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int color = entry & 0x0F;
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if ( color == 0 )
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lo = hi;
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if ( color == 0x0D )
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hi = lo;
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if ( color > 0x0D )
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hi = lo = 0.0f;
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{
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/* phases [i] = cos( i * PI / 6 ) */
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static float const phases [0x10 + 3] = {
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-1.0f, -0.866025f, -0.5f, 0.0f, 0.5f, 0.866025f,
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1.0f, 0.866025f, 0.5f, 0.0f, -0.5f, -0.866025f,
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-1.0f, -0.866025f, -0.5f, 0.0f, 0.5f, 0.866025f,
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1.0f
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};
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#define TO_ANGLE_SIN( color ) phases [color]
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#define TO_ANGLE_COS( color ) phases [(color) + 3]
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/* Convert raw waveform to YIQ */
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float sat = (hi - lo) * 0.5f;
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float i = TO_ANGLE_SIN( color ) * sat;
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float q = TO_ANGLE_COS( color ) * sat;
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float y = (hi + lo) * 0.5f;
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/* Optionally use base palette instead */
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if ( setup->base_palette )
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{
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unsigned char const* in = &setup->base_palette [(entry & 0x3F) * 3];
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static float const to_float = 1.0f / 0xFF;
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float r = to_float * in [0];
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float g = to_float * in [1];
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float b = to_float * in [2];
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q = RGB_TO_YIQ( r, g, b, y, i );
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}
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/* Apply color emphasis */
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#ifdef NES_NTSC_EMPHASIS
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{
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int tint = entry >> 6 & 7;
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if ( tint && color <= 0x0D )
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{
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static float const atten_mul = 0.79399f;
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static float const atten_sub = 0.0782838f;
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if ( tint == 7 )
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{
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y = y * (atten_mul * 1.13f) - (atten_sub * 1.13f);
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}
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else
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{
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static unsigned char const tints [8] = { 0, 6, 10, 8, 2, 4, 0, 0 };
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int const tint_color = tints [tint];
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float sat = hi * (0.5f - atten_mul * 0.5f) + atten_sub * 0.5f;
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y -= sat * 0.5f;
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if ( tint >= 3 && tint != 4 )
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{
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/* combined tint bits */
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sat *= 0.6f;
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y -= sat;
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}
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i += TO_ANGLE_SIN( tint_color ) * sat;
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q += TO_ANGLE_COS( tint_color ) * sat;
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}
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}
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}
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#endif
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/* Optionally use palette instead */
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if ( setup->palette )
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{
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unsigned char const* in = &setup->palette [entry * 3];
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static float const to_float = 1.0f / 0xFF;
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float r = to_float * in [0];
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float g = to_float * in [1];
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float b = to_float * in [2];
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q = RGB_TO_YIQ( r, g, b, y, i );
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}
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/* Apply brightness, contrast, and gamma */
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y *= (float) setup->contrast * 0.5f + 1;
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/* adjustment reduces error when using input palette */
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y += (float) setup->brightness * 0.5f - 0.5f / 256;
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{
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float r, g, b = YIQ_TO_RGB( y, i, q, default_decoder, float, r, g );
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/* fast approximation of n = pow( n, gamma ) */
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r = (r * gamma_factor - gamma_factor) * r + r;
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g = (g * gamma_factor - gamma_factor) * g + g;
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b = (b * gamma_factor - gamma_factor) * b + b;
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q = RGB_TO_YIQ( r, g, b, y, i );
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}
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i *= rgb_unit;
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q *= rgb_unit;
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y *= rgb_unit;
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y += rgb_offset;
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/* Generate kernel */
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{
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int r, g, b = YIQ_TO_RGB( y, i, q, impl.to_rgb, int, r, g );
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/* blue tends to overflow, so clamp it */
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nes_ntsc_rgb_t rgb = PACK_RGB( r, g, (b < 0x3E0 ? b: 0x3E0) );
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if ( setup->palette_out )
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RGB_PALETTE_OUT( rgb, &setup->palette_out [entry * 3] );
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if ( ntsc )
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{
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nes_ntsc_rgb_t* kernel = ntsc->table [entry];
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gen_kernel( &impl, y, i, q, kernel );
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if ( merge_fields )
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merge_kernel_fields( kernel );
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correct_errors( rgb, kernel );
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}
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}
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}
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}
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}
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#ifndef NES_NTSC_NO_BLITTERS
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void nes_ntsc_blit( nes_ntsc_t const* ntsc, NES_NTSC_IN_T const* input, long in_row_width,
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int burst_phase, int in_width, int in_height, void* rgb_out, long out_pitch )
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{
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int chunk_count = (in_width - 1) / nes_ntsc_in_chunk;
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for ( ; in_height; --in_height )
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{
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NES_NTSC_IN_T const* line_in = input;
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NES_NTSC_BEGIN_ROW( ntsc, burst_phase,
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nes_ntsc_black, nes_ntsc_black, NES_NTSC_ADJ_IN( *line_in ) );
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nes_ntsc_out_t* restrict line_out = (nes_ntsc_out_t*) rgb_out;
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int n;
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++line_in;
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for ( n = chunk_count; n; --n )
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{
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/* order of input and output pixels must not be altered */
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NES_NTSC_COLOR_IN( 0, NES_NTSC_ADJ_IN( line_in [0] ) );
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NES_NTSC_RGB_OUT( 0, line_out [0], NES_NTSC_OUT_DEPTH );
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NES_NTSC_RGB_OUT( 1, line_out [1], NES_NTSC_OUT_DEPTH );
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NES_NTSC_COLOR_IN( 1, NES_NTSC_ADJ_IN( line_in [1] ) );
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NES_NTSC_RGB_OUT( 2, line_out [2], NES_NTSC_OUT_DEPTH );
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NES_NTSC_RGB_OUT( 3, line_out [3], NES_NTSC_OUT_DEPTH );
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NES_NTSC_COLOR_IN( 2, NES_NTSC_ADJ_IN( line_in [2] ) );
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NES_NTSC_RGB_OUT( 4, line_out [4], NES_NTSC_OUT_DEPTH );
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NES_NTSC_RGB_OUT( 5, line_out [5], NES_NTSC_OUT_DEPTH );
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NES_NTSC_RGB_OUT( 6, line_out [6], NES_NTSC_OUT_DEPTH );
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line_in += 3;
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line_out += 7;
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}
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/* finish final pixels */
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NES_NTSC_COLOR_IN( 0, nes_ntsc_black );
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NES_NTSC_RGB_OUT( 0, line_out [0], NES_NTSC_OUT_DEPTH );
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NES_NTSC_RGB_OUT( 1, line_out [1], NES_NTSC_OUT_DEPTH );
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NES_NTSC_COLOR_IN( 1, nes_ntsc_black );
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NES_NTSC_RGB_OUT( 2, line_out [2], NES_NTSC_OUT_DEPTH );
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NES_NTSC_RGB_OUT( 3, line_out [3], NES_NTSC_OUT_DEPTH );
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NES_NTSC_COLOR_IN( 2, nes_ntsc_black );
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NES_NTSC_RGB_OUT( 4, line_out [4], NES_NTSC_OUT_DEPTH );
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NES_NTSC_RGB_OUT( 5, line_out [5], NES_NTSC_OUT_DEPTH );
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NES_NTSC_RGB_OUT( 6, line_out [6], NES_NTSC_OUT_DEPTH );
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burst_phase = (burst_phase + 1) % nes_ntsc_burst_count;
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input += in_row_width;
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rgb_out = (char*) rgb_out + out_pitch;
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}
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}
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#endif
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